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A toll-free telephone number is a number that is billed for all incoming calls, not for the caller. Learn about the history, features and types of toll-free numbers in different countries and regions.
Learn about the history, assignment, and operation of toll-free telephone numbers in the North American Numbering Plan, which have the area code prefixes 800, 833, 844, 855, 866, 877, and 888. Find out how to call or get a toll-free number in the U.S. or Canada, and what are the special cases and restrictions.
The North American Numbering Plan (NANP) is a telephone numbering system for twenty-five regions in twenty countries, primarily in North America and the Caribbean. It uses a three-digit area code to identify each numbering plan area (NPA) and a seven-digit telephone number for each subscriber.
Directory assistance or 411 is a phone service to find out a specific telephone number and/or address of a residence, business, or government entity. Learn how to use 411 in different areas, billing methods, data sources, and alternative services in the U.S. and Canada.
Learn about the history and features of ANI, a telecom network service for identifying the originating telephone number on toll calls. Find out how ANI differs from caller ID, toll-free numbers, and DNIS.
A form of toll-free telephone service in North America was the Zenith number, published in distant cities from where a company expected or desired frequent customer calls. Published as "Zenith" and a four- or five-digit number, these collect calls required operator assistance.
Learn about the history and types of long-distance calls, which are telephone calls made to a location outside a defined local calling area. Find out how long-distance calls are charged, connected, and regulated in different countries and regions.
Learn about the definition, types, and uses of premium-rate telephone numbers, which charge callers higher prices for select services. Compare the formats and regulations of premium-rate numbers in different countries and regions.
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